diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 21f7f1c..4472129 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -43,6 +43,8 @@
 
 int intel_sanitize_enable_execlists(struct drm_device *dev, int enable_execlists)
 {
+	WARN_ON(i915.enable_ppgtt == -1);
+
 	if (enable_execlists == 0)
 		return 0;